drivers/acpi/ac.c

   1 /*
   2  *  acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/slab.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #ifdef CONFIG_ACPI_PROCFS_POWER
  32 #include <linux/proc_fs.h>
  33 #include <linux/seq_file.h>
  34 #endif
  35 #include <linux/power_supply.h>
  36 #include <acpi/acpi_bus.h>
  37 #include <acpi/acpi_drivers.h>
  38
  39 #define PREFIX "ACPI: "
  40
  41 #define ACPI_AC_CLASS                   "ac_adapter"
  42 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
  43 #define ACPI_AC_FILE_STATE              "state"
  44 #define ACPI_AC_NOTIFY_STATUS           0x80
  45 #define ACPI_AC_STATUS_OFFLINE          0x00
  46 #define ACPI_AC_STATUS_ONLINE           0x01
  47 #define ACPI_AC_STATUS_UNKNOWN          0xFF
  48
  49 #define _COMPONENT              ACPI_AC_COMPONENT
  50 ACPI_MODULE_NAME("ac");
  51
  52 MODULE_AUTHOR("Paul Diefenbaugh");
  53 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
  54 MODULE_LICENSE("GPL");
  55
  56 #ifdef CONFIG_ACPI_PROCFS_POWER
  57 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  58 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  59 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
  60 #endif
  61
  62 static int acpi_ac_add(struct acpi_device *device);
  63 static int acpi_ac_remove(struct acpi_device *device, int type);
  64 static int acpi_ac_resume(struct acpi_device *device);
  65 static void acpi_ac_notify(struct acpi_device *device, u32 event);
  66
  67 static const struct acpi_device_id ac_device_ids[] = {
  68         {"ACPI0003", 0},
  69         {"", 0},
  70 };
  71 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  72
  73 static struct acpi_driver acpi_ac_driver = {
  74         .name = "ac",
  75         .class = ACPI_AC_CLASS,
  76         .ids = ac_device_ids,
  77         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
  78         .ops = {
  79                 .add = acpi_ac_add,
  80                 .remove = acpi_ac_remove,
  81                 .resume = acpi_ac_resume,
  82                 .notify = acpi_ac_notify,
  83                 },
  84 };
  85
  86 struct acpi_ac {
  87         struct power_supply charger;
  88         struct acpi_device * device;
  89         unsigned long long state;
  90 };
  91
  92 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
  93
  94 #ifdef CONFIG_ACPI_PROCFS_POWER
  95 static const struct file_operations acpi_ac_fops = {
  96         .owner = THIS_MODULE,
  97         .open = acpi_ac_open_fs,
  98         .read = seq_read,
  99         .llseek = seq_lseek,
 100         .release = single_release,
 101 };
 102 #endif
 103 static int get_ac_property(struct power_supply *psy,
 104                            enum power_supply_property psp,
 105                            union power_supply_propval *val)
 106 {
 107         struct acpi_ac *ac = to_acpi_ac(psy);
 108         switch (psp) {
 109         case POWER_SUPPLY_PROP_ONLINE:
 110                 val->intval = ac->state;
 111                 break;
 112         default:
 113                 return -EINVAL;
 114         }
 115         return 0;
 116 }
 117
 118 static enum power_supply_property ac_props[] = {
 119         POWER_SUPPLY_PROP_ONLINE,
 120 };
 121 /* --------------------------------------------------------------------------
 122                                AC Adapter Management
 123    -------------------------------------------------------------------------- */
 124
 125 static int acpi_ac_get_state(struct acpi_ac *ac)
 126 {
 127         acpi_status status = AE_OK;
 128
 129
 130         if (!ac)
 131                 return -EINVAL;
 132
 133         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
 134         if (ACPI_FAILURE(status)) {
 135                 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
 136                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 137                 return -ENODEV;
 138         }
 139
 140         return 0;
 141 }
 142
 143 #ifdef CONFIG_ACPI_PROCFS_POWER
 144 /* --------------------------------------------------------------------------
 145                               FS Interface (/proc)
 146    -------------------------------------------------------------------------- */
 147
 148 static struct proc_dir_entry *acpi_ac_dir;
 149
 150 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 151 {
 152         struct acpi_ac *ac = seq->private;
 153
 154
 155         if (!ac)
 156                 return 0;
 157
 158         if (acpi_ac_get_state(ac)) {
 159                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 160                 return 0;
 161         }
 162
 163         seq_puts(seq, "state:                   ");
 164         switch (ac->state) {
 165         case ACPI_AC_STATUS_OFFLINE:
 166                 seq_puts(seq, "off-line\n");
 167                 break;
 168         case ACPI_AC_STATUS_ONLINE:
 169                 seq_puts(seq, "on-line\n");
 170                 break;
 171         default:
 172                 seq_puts(seq, "unknown\n");
 173                 break;
 174         }
 175
 176         return 0;
 177 }
 178
 179 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
 180 {
 181         return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
 182 }
 183
 184 static int acpi_ac_add_fs(struct acpi_device *device)
 185 {
 186         struct proc_dir_entry *entry = NULL;
 187
 188         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
 189                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 190         if (!acpi_device_dir(device)) {
 191                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 192                                                      acpi_ac_dir);
 193                 if (!acpi_device_dir(device))
 194                         return -ENODEV;
 195         }
 196
 197         /* 'state' [R] */
 198         entry = proc_create_data(ACPI_AC_FILE_STATE,
 199                                  S_IRUGO, acpi_device_dir(device),
 200                                  &acpi_ac_fops, acpi_driver_data(device));
 201         if (!entry)
 202                 return -ENODEV;
 203         return 0;
 204 }
 205
 206 static int acpi_ac_remove_fs(struct acpi_device *device)
 207 {
 208
 209         if (acpi_device_dir(device)) {
 210                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
 211
 212                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
 213                 acpi_device_dir(device) = NULL;
 214         }
 215
 216         return 0;
 217 }
 218 #endif
 219
 220 /* --------------------------------------------------------------------------
 221                                    Driver Model
 222    -------------------------------------------------------------------------- */
 223
 224 static void acpi_ac_notify(struct acpi_device *device, u32 event)
 225 {
 226         struct acpi_ac *ac = acpi_driver_data(device);
 227
 228
 229         if (!ac)
 230                 return;
 231
 232         switch (event) {
 233         default:
 234                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 235                                   "Unsupported event [0x%x]\n", event));
 236         case ACPI_AC_NOTIFY_STATUS:
 237         case ACPI_NOTIFY_BUS_CHECK:
 238         case ACPI_NOTIFY_DEVICE_CHECK:
 239                 acpi_ac_get_state(ac);
 240                 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
 241                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 242                                                   dev_name(&device->dev), event,
 243                                                   (u32) ac->state);
 244                 acpi_notifier_call_chain(device, event, (u32) ac->state);
 245                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 246         }
 247
 248         return;
 249 }
 250
 251 static int acpi_ac_add(struct acpi_device *device)
 252 {
 253         int result = 0;
 254         struct acpi_ac *ac = NULL;
 255
 256
 257         if (!device)
 258                 return -EINVAL;
 259
 260         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 261         if (!ac)
 262                 return -ENOMEM;
 263
 264         ac->device = device;
 265         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 266         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 267         device->driver_data = ac;
 268
 269         result = acpi_ac_get_state(ac);
 270         if (result)
 271                 goto end;
 272
 273 #ifdef CONFIG_ACPI_PROCFS_POWER
 274         result = acpi_ac_add_fs(device);
 275 #endif
 276         if (result)
 277                 goto end;
 278         ac->charger.name = acpi_device_bid(device);
 279         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
 280         ac->charger.properties = ac_props;
 281         ac->charger.num_properties = ARRAY_SIZE(ac_props);
 282         ac->charger.get_property = get_ac_property;
 283         power_supply_register(&ac->device->dev, &ac->charger);
 284
 285         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 286                acpi_device_name(device), acpi_device_bid(device),
 287                ac->state ? "on-line" : "off-line");
 288
 289       end:
 290         if (result) {
 291 #ifdef CONFIG_ACPI_PROCFS_POWER
 292                 acpi_ac_remove_fs(device);
 293 #endif
 294                 kfree(ac);
 295         }
 296
 297         return result;
 298 }
 299
 300 static int acpi_ac_resume(struct acpi_device *device)
 301 {
 302         struct acpi_ac *ac;
 303         unsigned old_state;
 304         if (!device || !acpi_driver_data(device))
 305                 return -EINVAL;
 306         ac = acpi_driver_data(device);
 307         old_state = ac->state;
 308         if (acpi_ac_get_state(ac))
 309                 return 0;
 310         if (old_state != ac->state)
 311                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 312         return 0;
 313 }
 314
 315 static int acpi_ac_remove(struct acpi_device *device, int type)
 316 {
 317         struct acpi_ac *ac = NULL;
 318
 319
 320         if (!device || !acpi_driver_data(device))
 321                 return -EINVAL;
 322
 323         ac = acpi_driver_data(device);
 324
 325         if (ac->charger.dev)
 326                 power_supply_unregister(&ac->charger);
 327 #ifdef CONFIG_ACPI_PROCFS_POWER
 328         acpi_ac_remove_fs(device);
 329 #endif
 330
 331         kfree(ac);
 332
 333         return 0;
 334 }
 335
 336 static int __init acpi_ac_init(void)
 337 {
 338         int result;
 339
 340         if (acpi_disabled)
 341                 return -ENODEV;
 342
 343 #ifdef CONFIG_ACPI_PROCFS_POWER
 344         acpi_ac_dir = acpi_lock_ac_dir();
 345         if (!acpi_ac_dir)
 346                 return -ENODEV;
 347 #endif
 348
 349         result = acpi_bus_register_driver(&acpi_ac_driver);
 350         if (result < 0) {
 351 #ifdef CONFIG_ACPI_PROCFS_POWER
 352                 acpi_unlock_ac_dir(acpi_ac_dir);
 353 #endif
 354                 return -ENODEV;
 355         }
 356
 357         return 0;
 358 }
 359
 360 static void __exit acpi_ac_exit(void)
 361 {
 362
 363         acpi_bus_unregister_driver(&acpi_ac_driver);
 364
 365 #ifdef CONFIG_ACPI_PROCFS_POWER
 366         acpi_unlock_ac_dir(acpi_ac_dir);
 367 #endif
 368
 369         return;
 370 }
 371
 372 module_init(acpi_ac_init);
 373 module_exit(acpi_ac_exit);